Nuts and Washers

Standard Nut Types

• Hex nut
  
  • A six-sided nut
  • Most commonly used 
    
• Slotted/Castle Nut
  
  • Slotted nuts are used in conjunction with a cotter/split pin on the drilled bolt to prevent loosening
    
• Wing Nuts
  • One pick nut with two wings-180° apart
  • Used in low torque applications that require frequent adjustments
• Nylon Insert Locknut
  • A nut with a nylon insert to prevent backing off
  • Also referred to as a "Nylock" 
    

Why are washers used?

• To distribute the pressure of the bolt/nut evenly over the surface, so that the surface isn't damaged
• Lock washers secure fasteners that tend to rotate or lose friction
• Allows for a smooth surface to the screw to slide against as it is installed to make installation easier and more secure

Some standard washer types:

• Flat
  
  • A flat washer, used to distribute load
    
• Slip Lock
  • The most common style of washer
  • Used to prevent nuts and bolt from backing out
    
    
    
• Internal Tooth Lock
  
  • A washer with internal "teeth"
  • Used to prevent nuts and bolts from backing out 
    
• External Tooth Lock
  • A washer with external "teeth"
  • Used to prevent nuts and bolts from backing out